Stator core structure of hub motor

Abstract

The utility model provides a stator core structure of a hub motor, and belongs to the technical field of motor production, the stator core structure comprises a plurality of fanning strips, and the fanning strips are spliced in sequence to form an annular stator sheet; the fanning strip comprises an arc-shaped plate, winding teeth, a concave structure and a convex structure, and the multiple winding teeth are evenly distributed on the outer circle of the arc-shaped plate at intervals; a concave structure is arranged on one side of the arc-shaped plate in the circumferential direction, a convex structure is arranged on the other side of the arc-shaped plate in the circumferential direction, and the concave structure and the convex structure can be tightly embedded and matched in size. According to the structure, the cost of a stamping die can be remarkably reduced while the product quality is guaranteed, the material utilization rate is increased, and the production cost is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of permanent magnet motors and relates to a bicycle hub motor, and specifically to a hub motor stator core structure. Background Art

[0002] At present, the mass production of stator cores for two-wheeled electric bicycle motors mostly adopts the stamping and winding process. This process is very beneficial for mass production. It can not only improve the utilization rate of materials, but also speed up production. However, the mold costs of hundreds of thousands or even millions of yuan are a heavy burden for many small and medium-sized enterprises.

[0003] For small batch production, opening molds is even more uneconomical. Most motor stator sheets are processed by wire cutting or laser cutting. These two methods have slow processing speeds. In addition, due to the particularity of hub motors, they are outer rotor motors and the rotors generally do not require silicon steel sheets. Therefore, the processing residue in the middle of the stator sheet material can only be treated as waste, with low material utilization and high processing costs. Summary of the invention

[0004] The purpose of the present application is to overcome the deficiencies of the prior art and provide a hub motor stator core structure.

[0005] A hub motor stator core structure comprises a plurality of sector-shaped pieces, which can be spliced ​​in sequence to form an annular stator piece; the sector-shaped piece comprises an arc-shaped plate, winding teeth, a concave structure and a convex structure, and a plurality of winding teeth are evenly spaced on the outer circle of the arc-shaped plate; a concave structure is arranged on one circumferential side of the arc-shaped plate, and a convex structure is arranged on the other circumferential side of the arc-shaped plate, and the concave structure and the convex structure can be tightly embedded and matched.

[0006] By adopting the above technical solution, the structure divides the overall annular stator sheet into multiple sector-shaped single-piece structures, and the stamping area of ​​each single piece is significantly reduced, thereby greatly reducing the cost of the stamping die and reducing the requirements for the tonnage of the punch press. A splicing structure is added to the equally divided stator sector-shaped sheets, one side is designed as a convex shape, and the other side is designed as a concave shape. Adjacent sector-shaped sheets are spliced ​​with each other, and the assembly process is simple and the splicing position is accurate.

[0007] Preferably, the arc-shaped plate, the winding teeth, the concave structure and the convex structure are an integral sheet structure formed by integral stamping.

[0008] By adopting the above technical solution, the structure on a single sector piece is stamped as a whole, with precise dimensions and high structural strength. The structure of the sector piece can improve the utilization rate of the stamping plate and save materials.

[0009] Preferably, the inner circle of the arc-shaped plate is evenly spaced with positioning grooves, and the positioning grooves are used to reserve and determine welding positions.

[0010] By adopting the above technical solution, a concave groove for welding is reserved on the inner circle of the sector-shaped piece, so as to reserve a position for welding in the subsequent process, and the positioning position is accurate.

[0011] Preferably, the fan-shaped sheets are multiple and stacked, and the positioning grooves of the multiple stacked fan-shaped sheets correspond to each other. The positioning grooves are used to accommodate solder formed by welding so that the multiple stacked fan-shaped sheets are fixedly connected to form a fan-shaped stack.

[0012] By adopting the above technical solution, the fan-shaped sheet structure in the present application can be processed into a laminated structure core, and the sheets are connected by welding.

[0013] Preferably, the circumferential ends of the concave structure and the convex structure are both provided with semicircular nail holes, and the semicircular nail holes of the concave structure and the convex structure can be spliced ​​relative to each other to form a complete circular nail hole.

[0014] By adopting the above technical solution, the structure designs connection hole positions at the concave and convex splicing connections, and rivets, locking bolts and other strengthening connection accessories can be set in the nail holes.

[0015] Preferably, a rivet is fixed in the circular nail hole.

[0016] By adopting the above technical solution, rivets are used to further strengthen the connection between adjacent sector pieces, making it firm and reliable.

[0017] Preferably, the dimensions of the sector pieces are all the same.

[0018] By adopting the above technical solution, the fan-shaped pieces have the same size, and only one size of the punching die corresponding to the fan-shaped pieces can be opened, which reduces costs. In addition, the fan-shaped pieces of the same size are easy to assemble, simplifying the production process and improving efficiency.

[0019] Preferably, the number of the sector-shaped pieces is four to sixteen.

[0020] By adopting the above technical solution, the solution of this embodiment is evenly divided into twelve sector-shaped segments, and the sector-shaped segments can be designed to have various numbers according to the stator size and processing capacity that need to be processed.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. Since this structure adopts the design of dividing a whole circle of stator sheets into 12 stator sector sheets, the stamping area is reduced, thereby reducing the cost of stamping dies, and at the same time reducing the requirements for the tonnage of the punch press, simplifying the production process, and improving production efficiency. 2. The design of the splicing structure is preferably adopted in this structure. Through the splicing method of a convex structure on one side and a concave structure on the other side, the stator sector sheets can be quickly assembled into a complete stator core structure, thereby improving the convenience and efficiency of assembly. 3. This structure is provided with a welding concave groove on the inner circle of the stator sector sheet to leave a position for welding in the subsequent process, facilitate the welding operation, and improve the welding quality and efficiency. 4. This structure is provided with rivet holes at the splicing structure, and rivets are driven in after splicing, which further improves the stability after splicing and enhances the overall strength and reliability of the stator core structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the plan structure of an embodiment of the present structure.

[0024] Figure 2 It is a schematic diagram of the plan structure of another embodiment of the present structure.

[0025] Figure numerals: 1, fan-shaped piece; 101, winding tooth; 102, arc-shaped plate; 103, concave structure; 104, positioning groove; 105, convex structure; 2, rivet. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the accompanying drawings.

[0027] A hub motor stator core structure, see attached Figure 1 As shown, it comprises a plurality of sector-shaped sheets 1, and the plurality of sector-shaped sheets 1 are sequentially spliced ​​to form an annular stator sheet, and the plurality of annular stator sheets are stacked and fixed to form a stator core;

[0028] The splicing positions of adjacent sector-shaped sheets 1 are all provided with holes, and rivets 2 are fixedly installed in the holes to fix the stacked annular stator sheets.

[0029] The annular stator segments shown in this embodiment are evenly divided into 12 sector-shaped segments 1 of the same size. The annular stator segments can be divided into other different numbers of sector-shaped segments 1, such as 2 to 16, according to the design size.

[0030] See attached Figure 2 As shown, the fan-shaped piece 1 includes an arc-shaped plate 102, a winding tooth 101, a concave structure 103 and a convex structure 105.

[0031] The curvature of the arc plate 102 is set according to the circumferential size of the annular stator sheet. The outer circle of the arc plate 102 is evenly spaced with a plurality of winding teeth 101 along the circumferential direction. Winding grooves for winding the stator coil are symmetrically arranged on both sides of the circumference of the winding teeth 101.

[0032] A plurality of positioning grooves 104 are evenly spaced along the circumference of the inner circle of the arc plate 102. The two positioning grooves 104 shown in the drawings of this embodiment are used to reserve and determine the welding position. The positioning grooves 104 are used to accommodate the solder formed by welding so that the multiple stacked sector sheets 1 are fixedly connected to form a sector stack.

[0033] A concave structure 103 is provided on one circumferential side of the arc plate 102, and a convex structure 105 is provided on the other circumferential side of the arc plate 102. The sizes of the concave structure 103 and the convex structure 105 match, and the convex structure 105 can be embedded in the concave structure 103, so that the adjacent arc plates 102 are tightly connected.

[0034] Semicircular nail holes are provided at the circumferential ends of the concave structure 103 and the convex structure 105. The radius of the nail holes matches the size of the rivet 2. When adjacent arc-shaped plates 102 are spliced, the semicircular nail holes of the concave structure 103 and the convex structure 105 are relatively combined to form a complete circular nail hole.

[0035] The arc plate 102, the winding teeth 101, the concave structure 103 and the convex structure 105 are integral structures, which are integrally punched by a punching machine.

[0036] Processing sequence:

[0037] Step 1: Single-piece stamping of the fan-shaped sheet;

[0038] Step 2: The stamped fan-shaped sheets are stacked and welded to form fan-shaped stacked sheets;

[0039] Step 3: assembling multiple groups of fan-shaped laminations into a circular ring structure;

[0040] Step 4: Drive rivets to secure it and further improve stability.

[0041] The stator core processing is completed.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hub motor stator core structure, characterized in that: It comprises a plurality of sector-shaped pieces (1), and the plurality of sector-shaped pieces (1) are sequentially spliced ​​to form an annular stator piece; The fan-shaped sheet (1) comprises an arc-shaped plate (102), winding teeth (101), a concave structure (103) and a convex structure (105); a plurality of winding teeth (101) are evenly spaced on the outer circle of the arc-shaped plate (102); a concave structure (103) is arranged on one circumferential side of the arc-shaped plate (102); a convex structure (105) is arranged on the other circumferential side of the arc-shaped plate (102); and the concave structure (103) and the convex structure (105) can be tightly embedded and matched.

2. The hub motor stator core structure according to claim 1, characterized in that: The arc-shaped plate (102), the winding teeth (101), the concave structure (103) and the convex structure (105) are an integral sheet-like structure formed by integral stamping.

3. The hub motor stator core structure according to claim 1, characterized in that: The inner circle of the arc-shaped plate (102) is evenly spaced with positioning grooves (104), and the positioning grooves (104) are used to reserve and determine welding positions.

4. The hub motor stator core structure according to claim 3, characterized in that: The fan-shaped sheets (1) are multiple and stacked, and the positioning grooves (104) of the multiple stacked fan-shaped sheets (1) are located at corresponding positions. The positioning grooves (104) are used to accommodate solder formed by welding so that the multiple stacked fan-shaped sheets (1) are fixedly connected to form a fan-shaped stack.

5. The hub motor stator core structure according to claim 3, characterized in that: The circumferential ends of the concave structure (103) and the convex structure (105) are both provided with semicircular nail holes, and the semicircular nail holes of the concave structure (103) and the convex structure (105) can be spliced ​​relative to each other to form a complete circular nail hole.

6. The hub motor stator core structure according to claim 5, characterized in that: A rivet (2) is fixed in the circular nail hole.

7. The hub motor stator core structure according to claim 1, characterized in that: The dimensions of the sector-shaped pieces (1) are all the same.

8. The hub motor stator core structure according to claim 7, characterized in that: The number of the sector-shaped pieces (1) is four to sixteen.

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